20" X 40" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 22 5/8" X 42 5/8"] Fixed Blades with Damper R value rating of insulation

R value rating of insulation - r3

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 14" duct opening (measured at the opening)

+ Product Details Size - 30"w X 28"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 18 5/8" width X 8 5/8" height -

+ Product Details Size - 36"w X 18"h is the size for the duct opening measurement only

20" X 40" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 22 5/8" X 42 5/8"] Fixed Blades with Damper R value rating of insulation+ Product Details Size 20"w X 40"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 22 5 8" width X 42 5 8" height High Quality high quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Sidewall & ceiling Design removable frame for easy filter change & cleaning uses a 1" thick filter. Our filter grille latch is easy to use on your